Helcystogramma rectangulum, Li & Zhen, 2011
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Helcystogramma rectangulum sp. nov.
CHINA: Shaanxi Province: 1 male, 1 female, same data as for holotype GoogleMaps ; 1 male, 6 July 1990, coll. Jinfu Li, same location and altitude as for holotype GoogleMaps ; Guizhou Province: 2 females, Guocun, Daozhen (28 ◦ 53 ′ N, 107 ◦ 36 ′ E), 1300 m, 20 August 2004, coll. Yunli Xiao GoogleMaps ; 2 males, 3 females, Dashahe, Daozhen (28 ◦ 53 ′ N, 107 ◦ 36 ′ E), 1370 m, 24–25 August 2004, coll. Yunli Xiao GoogleMaps ; 1 male, 1350 m, 25 May 2004, coll. Shulian Hao; Hunan Province: 4 males, Mt Badagong, Sangzhi (29 ◦ 23 ′ N, 110 ◦ 11 ′ E), 1250 m, 13 August 2001, coll. Houhun Li and Xinpu Wang GoogleMaps ; Sichuan Province: 3 males, 2 females, Fengtongzhai, Baoxing (30 ◦ 22 ′ N, 102 ◦ 50 ′ E), 1600 m, 2–3 August 2004, coll. Yingdang Ren GoogleMaps ; 1 female, Wolong (30 ◦ 59 ′ N, 103 ◦ 08 ′ E), 1900 m, 9 August 2004, coll. Yingdang Ren GoogleMaps ; 4 males, Mt Qingcheng (30 ◦ 58 ′ N, 103 ◦ 31 ′ E), 10, 26 July 1980 ( IZCAS) GoogleMaps .
Helcystogramma rectangulum sp. nov. resembles H. trijunctum (Meyrick) , but differs from it in the greyish-brown to yellowish-brown forewing; the lobes of vinculum with inner margin protruding, forming a right angle mesially, and the aedeagus slightly dilated distally in the male genitalia.
Adult ( Figures 4C View Figure 4 , 9H View Figure 9 ). Wingspan 13.0–17.0 mm. Head greyish-brown, with coppercoloured metallic lustre. Antenna with scape greyish-brown to dark brown on dorsal surface, yellowish-white on ventral surface; flagellum alternately greyish-yellow and dark brown on dorsal surface, yellow on ventral surface. Labial palpus dorsally with long scales on distal two-thirds of second segment and on middle of third segment; second segment about twice length of diameter of eye, third segment about three-fifths length of second; brown to dark brown, tinged with pale yellow on ventral surface, and greyish-white on inner surface, third segment yellow apically. Thorax and tegula greyish-brown to brown, with copper-coloured metallic lustre; without hair pencil from anepisternum on mesothorax. Forewing with costal margin almost straight, termen truncate; ground colour greyish-brown to brown, scattered dark brown scales becoming denser distally, termen dark brown; black scale tufts at middle and end of cell as well as at middle of fold, the last one largest; narrow yellowish-brown fascia from costal six-sevenths length to before tornus, arched outward, sometimes faint; fringe greyish-brown except greyish-white basally. Hindwing and fringe grey. Fore- and midlegs greyish-brown on outer surface, yellowish-white on inner surface; hindleg with femur, distal two-fifths of tibia and tarsus greyish-brown, basal three-fifths of tibia and apex of tarsomeres yellowish-white on outer surface, femur greyish-white, tibia and tarsus yellowish-white on inner surface. Abdomen dark brown on dorsal surface, greyish-yellow to greyish-brown on ventral surface.
Uncus with a small triangular process on posterior margin, median width about threefifths of basal width; about one-quarter length of valva ( Figure 13F View Figure 13 ). Gnathos short, narrowed from base to rounded apex, slightly shorter than one-quarter length of valva; culcitula semioval. Valva with dorsal and ventral margins almost parallel, bluntly rounded at apex, longer than tegumen–uncus complex; ventral free lobe slightly arched, with sparse long setae. Vinculum with lobes projecting on inner margin, forming a right angle mesially, distal two-fifths abruptly narrowed. Saccus bluntly rounded anteriorly. Aedeagus with basal two-fifths dilated and slightly rounded, then narrowed gradually, slightly dilated apically. Eighth tergite nearly inverted trapeziform, rounded posteriorly ( Figure 10Q View Figure 10 ).
Anterior apophyses about one-third length of posterior apophyses ( Figure 15F View Figure 15 ). Antrum nearly rectangular, slightly sclerotized. Ductus bursae about twice length of anterior apophyses; basal two-fifths narrow, membranous; distal three-fifths sclerotized, broadened toward corpus bursae. Corpus bursae oval; accessory bursa arising from anterior margin.
China (Guizhou, Hunan, Shaanxi, Sichuan) .
The specific name is derived from the Latin rectangulus, meaning right-angled, referring to the vinculum with inner margin projecting and forming a right angle mesially.
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